Quantitative research is a systematic investigation that primarily deals with the quantities of things, involving the measurement of quantity or amount. It's widely applied in various fields such as advertising audience research to develop actual numbers of audience members to accurately measure market situations.
A regression line is a line calculated in regression analysis that is used to estimate the relationship between two quantities, the independent variable and the dependent variable.
Systematic sampling is a probability sampling method where researchers select every nth observation from a larger population, following an initial randomly chosen starting point.
